Vacuum flask



FIG. 1 is a perspective view of a vacuum flask showing our new design thereof;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevationall view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a rear side view thereof. 

The ornamental design for a vacuum flask, as shown and described. 